body{
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin:0px auto;
    font-size: 16px;
    color:#666;
    height: 2000px;
}
*{
    margin:0;
    padding:0;
}
ul{
    list-style: none;
}
.app{
    height: 45px;
}
.app ul li{
    float: left;
    background-color: #333333;
    text-align: center;
    line-height: 45px;
    height: 45px;
    color:#ffffff;
}
.app ul li:nth-child(1){
    width: 8%;
}
.app ul li:nth-child(1) img{
    width: 10px;
    margin:17px auto;
}
.app ul li:nth-child(2){
    width: 10%;
}
.app ul li:nth-child(2) img{
    width: 30px;
    vertical-align: middle;
    margin:5px auto;
}
.app ul li:nth-child(3){
    width: 57%;
}
.app ul li:nth-child(4){
    width: 25%;
    background-color: #F63515;
}
/*搜索*/
.search-wrap{
    height: 45px;
    position: fixed;
    width: 100%;
    overflow:hidden;
    min-width: 320px;
    max-width: 640px;
}
.search-btn{
    position: absolute;
    top:0;
    left: 0;
    width: 40px;
    height: 45px;
}
.search-btn::before{
    content:"";
    display: block;
    width: 20px;
    height: 18px;
    background:url("../images/s-btn.png") no-repeat;
    background-size: 20px 18px;
    margin:14px 0 0 15px;

}
.search-login{
    position: absolute;
    right: 0;
    top: 0;
    width: 40px;
    height: 45px;
    color:#ffffff;
    line-height: 45px;;
}
.search{
    height: 30px;
    margin:0px 50px;
    border-radius: 15px;
    line-height: 45px;
    margin-top:7px;
    position: relative;
    background-color: #ffffff;
}
.jd-icon{
    width: 20px;
    height: 15px;
    position: absolute;
    top:8px;
    left:13px;
    background:url("../images/jd.png") no-repeat;
    background-size: 20px 15px;
}
.jd-icon::after{
    position: absolute;
    content:"";
    top:0;
    right:-8px;
    display: block;
    width: 1px;
    height: 15px;
    background-color: #ccc;
}
.sou{
    position: absolute;
    top:8px;
    left:50px;
    width: 18px;
    height: 15px;
    background:url("../images/jd-sprites.png") no-repeat -80px 0 ;
    background-size: 200px auto;

}
/*轮播图 */
.slider{
    width: 100%;
}
/* 品牌日 */
.brand div{
    width: 33.33%;
    float: left;
}
.brand div img{
    width: 100%;
}
/*导航 */
.nav a{
    float: left;
    width: 20%;
    text-align: center;
    font-size: 14px;
    text-decoration: none;
    color:#666;
}
.nav a img{
    width: 40px;
    margin:10px;
}